Samsung 941SC Manual del usuario - Página 9

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The National Institutes of Health participates in some interagency working

group activities, as well.

FDA shares regulatory responsibilities for wireless phones with the Federal

Communications Commission (FCC). All phones that are sold in the United

States must comply with FCC safety guidelines that limit RF exposure.

FCC relies on FDA and other health agencies for safety questions about

wireless phones.

FCC also regulates the base stations that the wireless phone networks

rely upon. While these base stations operate at higher power than do the

wireless phones themselves, the RF exposures that people get from these

base stations are typically thousands of times lower than those they can

get from wireless phones. Base stations are thus not the primary subject

of the safety questions discussed in this document.

What are the results of the research done already?

The research done thus far has produced conflicting results, and many

studies have suffered from flaws in their research methods. Animal

experiments investigating the effects of radio frequency energy (RF)

exposures characteristic of wireless phones have yielded conflicting

results that often cannot be repeated in other laboratories. A few animal

studies, however, have suggested that low levels of RF could accelerate

the development of cancer in laboratory animals. However, many of the

studies that showed increased tumor development used animals that had

been genetically engineered or treated with cancer-causing chemicals so

as to be pre-disposed to develop cancer in absence of RF exposure. Other

studies exposed the animals to RF for up to 22 hours per day. These

conditions are not similar to the conditions under which people use

wireless phones, so we don't know with certainty what the results of such

studies mean for human health.

Three large epidemiology studies have been published since December

2000. Between them, the studies investigated any possible association

between the use of wireless phones and primary brain cancer, glioma,

meningioma, or acoustic neuroma, tumors of the brain or salivary gland,

leukemia, or other cancers. None of the studies demonstrated the

existence of any harmful health effects from wireless phones RF

exposures. However, none of the studies can answer questions about

long-term exposures, since the average period of phone use in these

studies was around three years.

What research is needed to decide whether RF exposure from

wireless phones poses a health risk?

A combination of laboratory studies and epidemiological studies of people

actually using wireless phones would provide some of the data that are

needed. Lifetime animal exposure studies could be completed in a few

years. However, very large numbers of animals would be needed to

provide reliable proof of a cancer promoting effect if one exists.

Epidemiological studies can provide data that is directly applicable to